Detect flames/fire with this flame sensor from Waveshare, detecting flame wavelength from 760nm to 1100nm. Note: Please do not use this sensor for critical home/industrial/commercial safety applications. Intended for development and learning/hobby purposes only. The sensor is used for detecting fire without any fire-protection for itself – please keep a distance from the fire to avoid damage! Sensitive to flame spectrum Features wide-range voltage comparator LM393 Adjustable sensitivity Signal output indicator Sensor only – no cable Specifications Spectrum range: 760nm ~ 1100nm Detection angle: 0 – 60 degree Power: 3.3V ~ 5.3V Operating temperature: -25 ~ 85 Dimension: 27.3mm * 15.4mm Mounting holes size: 2.0mm How to Use Product Wiki: https://www.waveshare.com/wiki/Flame_Sensor In the case of working with an MCU: VCC 3.3V ~ 5.3V GND power supply ground AOUT MCU.IO (analog output) DOUT MCU.IO (digital output)